l=[]
for i in range(65,91):
    l.append(chr(i))
for j in range(97,123):
    l.append(chr(j))
for k in range(48,58
 
):
    l.append(chr(k))
print(l)
ma=random.sample(l,4)
print(ma)
ma="".join(ma)
print(ma)

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